ePrints

Diesel-exhaust aerosol dynamics from the tailpipe to the dilution tunnel

Lookup NU author(s): Dr Yannis Drossinos

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.

Abstract

We study, experimentally and theoretically, the dynamics of non-volatile particles emitted from a diesel EURO 3 light-duty vehicle along the transfer tube that conducts exhaust fumes from the tailpipe to the dilution tunnel. Particle agglomeration, diffusional and thermophoretic transport are modeled. For turbulent, but moderate, Reynolds numbers and under steady-state conditions we map the combustion-generated nanoparticle dynamics onto a one-dimensional dynamics of aerosol particles in an ageing chamber. The aggregate fractal dimension, determined self-consistently by comparing mass distributions, varied from 2 to 2.3. The relative importance of aerosol processes is estimated by defining appropriate characteristic time scales. Agglomeration and convection by the bulk motion of the fluid are the dominant processes for inlet number concentrations of the order of 108 particles / cm3 and transfer-tube lengths of 6-9 m. Thermophoretic losses are calculated to be non-negligible. For modern vehicles with particulate filters agglomeration is estimated to be negligible, whereas thermophoresis may be significant. © 2008 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Isella L, Giechaskiel B, Drossinos Y

Publication type: Article

Publication status: Published

Journal: Journal of Aerosol Science

Year: 2008

Volume: 39

Issue: 9

Pages: 737-758

Print publication date: 01/09/2008

ISSN (print): 0021-8502

ISSN (electronic): 1879-1964

Publisher: Elsevier Ltd

URL: http://dx.doi.org/10.1016/j.jaerosci.2008.04.006

DOI: 10.1016/j.jaerosci.2008.04.006

Altmetrics

Share